f-number calculator

Enhance your photography with the LGT075T Diffusion Film, a customizable light guide acrylic sheet designed for uniform LED light diffusion on flat panel ...

Camera f numberexplained

May 20, 2011 — In the analog times, the resolution of film and/or lens was expressed in line pairs per millimeter (LP/mm). This unit expresses the amount of ...

Oct 10, 2023 — The ND filter allows photographers to shoot their wide-aperture lenses in bright light without overexposing. This allows shallow depth of field ...

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F-number and NA

f-number formula

Lesson Summary. A lens is an optical device composed of thin plastic or glass used to refract light and produce images. Refraction of light occurs when it bends ...

F-stop vs aperture

f-stop Many camera lenses have an adjustable iris that opens and closes at the front of the lens to limit the amount of light coming in.  When open all the way, the f-stop is the f-number.  From there, each f-stop from wide open halves the amount of light, which corresponds to reducing the size of the aperture by 1/sqrt(2) or about 0.707 and in turn halving the area.

While some of the microscope optical components act as image-forming elements, others serve to produce various modifications to illumination of the specimen and ...

The lens is the input to the machine vision system.  A low quality lens means that you have already degraded the image coming into the sensor.  For instance, let’s say you chose a camera with 5um pixels, which equates to a lens being able to resolve 100 lp/mm.  If your lens’ Modular Transform Function (MTF) is only 50 lp/mm, you should have chosen a camera with 10um pixel size, because the lens can’t do any better than that.   As a note, don’t infer that a camera with 10um pixels is worse than a camera with 5umpixels from this example, as that is not true.  Learn more on MTF here

F numberwelding

FUJI lens showing f-stopsf-number The f-number is defined as the ratio of the focal length by the aperture width (diameter of the entrance pupil).  So a 50mm focal length lens with a f-number of 2 has a 25mm entrance pupil.  The lower the f-number, the more light  will be allowed into the system, however this equates to more expensive  lens as you need more glass to make a wider entrance pupil.

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Camera f numberchart

1st Vision’s sales engineers have over 100 years of combined experience to assist in your camera selection.  With a large portfolio of lenses, cables, NIC card and industrial computers, we can provide a full vision solution!

A filter used in fluorescence microscopy that transmits specific bands or wavelengths of energy capable of inducing visible fluorescence in various substrates

F-stop chart

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In a practical application, you need to trade off exposure time, depth of field, and available machine vision  lighting.  These three variables are always in tension.  If you need fast exposure AND depth of field this means very small amounts of light gets to the sensor.  If you need high contrast images in this situation, something has to change.  Either get more light, accept less depth of field, or have some image blur.

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Why does 1stVision focus (no pun intended) so much on machine vision lenses.  As the old saying goes, if you have garbage in, you get garbage out.

A machine vision lens gathers light and then focuses it.  When we talk about focus, we are talking about the MTF, but when we discuss light gathering properties, we need to discuss the lens f-number.

I'm trying to do a black background that doesn't catch or reflect light. I don't want to use a green or blue screen because I need the only ...

20241016 — Want this question answered? Be notified when an answer is posted. Request Answer. Add your answer: Earn +20 pts. Q: What is a line pair?